作业帮(x^2+3)^2-2(x^2+3)(x+3)+(x+3)^2+(x^2-3)^2求答案
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(x^2+3)^2-2(x^2+3)(x+3)+(x+3)^2+(x^2-3)^2求答案
(x^2+3)^2-2(x^2+3)(x+3)+(x+3)^2+(x^2-3)^2求答案
(x^2+3)^2-2(x^2+3)(x+3)+(x+3)^2+(x^2-3)^2求答案
(x^2+3)^2-2(x^2+3)(x+3)+(x+3)^2+(x^2-3)^2
=x^4+6x^2+9-2x^3-6x^2-6x-18+x^2+6x+9-x^4-6x^2+9
=-2x^3-5x^2+9
(x^2+3)^2-2(x^2+3)(x+3)+(x+3)^2+(x^2-3)^2
=[(x^2+3)^2-2(x^2+3)(x+3)+(x+3)^2]+(x^2-3)^2
=[(x^2+3)-(x+3)]^2+(x^2-3)^2
=(x^2+3-x-3)^2+(x^2-3)^2
=(x^2-x)^2+(x^2-3)^2
=x^4-2x^3+x^2+x^4-6x^2+9
=2x^4-2x^3-5x^2+9
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